<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <script>
//        var str="DFFGGHHJJJJJJJ";
//        alert(str.toLowerCase())
        var str="fgfhghmjmjmj"
        alert(str.toUpperCase());
    </script>
</body>
</html>